Motion assisted sifting fork

ABSTRACT

A rake having a handle, and a rake head. The rake head includes a frame having a neck dimensioned to receive one end of the handle; a plurality of tines, the plurality of tines comprising: a movable inner tine section, the movable inner tine section having a first movable inner tine section, a second movable inner tine section and at least one fixed inner tine between the first movable inner tine section and the second inner tine section; and a fixed outer tine section on each side of the inner section; a support member extending across the plurality of tines, the support member comprising a plurality of supports positioned between the tines; and at screening material, which separates a wanted material from an unwanted material.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation-in-part of U.S. patent applicationSer. No. 12/429,604, which is a Continuation of U.S. patent applicationSer. No. 11/807,195, filed May 25, 2007, now U.S. Pat. No. 7,540,544,which is a Continuation-in-part of U.S. patent application Ser. No.11/412,702 filed Apr. 26, 2006, which are incorporated herein in theirentirety.

FIELD OF THE INVENTION

The invention generally relates to an improved rake and/or fork, andmore particularly to a motion assisted or motorized sifting rake and/orfork.

BACKGROUND OF THE INVENTION

It can be appreciated that for a considerable period of time, livestockanimals that are normally confined in stalls or pens or use a stall toget out of the weather have been provided with bedding material ofnatural straw. This bedding is provided to absorb the urine producedwhile the animal is confined, and to improve the comfort of the animal.Such stalls, whether using straw bedding, shavings, rice hull or sawdustmaterials, naturally require frequent removal of the urine soakedmaterial. As a consequence of this confinement there are alsoconsiderable manure deposits, which, by the activity of the animalwalking around the stall, can become mixed with the bedding andscattered around the stall. This mixture of urine, manure and beddingmust be frequently removed and replenished for the health of the animalsand to reduce noxious odors.

When raising or keeping horses, the bedding may be cleaned several timesa day or completely stripped and replenished daily or weekly. Thusly,the cost and storage of bedding materials, the extent to which it islost when cleaning and the size of composting piles and their disposalare problems faced by all in the field. During the past few decades, inaddition to straw, two additional types of bedding have come into fairlyregular use. One common type is pine or cedar wood shavings or chips,either in bulk form or compressed and bagged. The other being sawdust orcompressed sawdust pellets. Since shavings and sawdust or pellets havecome into common usage and that they are smaller or finer in comparisonto the long strands of straw, during the removal of bedding some siftingcan take place. All the urine soaked bedding will be removed and theundisturbed piles of manure will be discarded whole. However, themovement of horses in their stall results in many manure piles beingbroken down into smaller component manure balls. The sifting of thebedding to separate the small manure pieces from the voluminous bed ofshavings results in considerably less of the bedding material beingthrown out with the manure.

Manual cleaning of horse stalls or other livestock facilities istypically performed utilizing a manure fork, which consists of a forkhead configured with a row of plastic or metal tines. A handle typicallymade of wood having a circular cross-sectional shape is attached to forkhead.

In conventional practice of stall cleaning, there is substantial wastebecause much of the wood shaving bedding material becomes removed anddiscarded along with the manure, thus necessitating frequent costlyreplenishment that can amount to many cubic feet of shavings per weekper animal, representing a substantial cost and profuse disposal factor.The main approach presently available to control excess shavingsdisposal is to train, motivate and supervise workers to take the extratime and diligent effort to manually agitate the fork in a vigorous andtiring fashion to promote the separation of manure pieces from thebedding, thus reducing the quantity by salvaging the wood shavings;however such special training and effort is likely to be merely atradeoff, shifting the cost to labor and supervision, and could resultin zero or negative savings overall. The cost of wasted bedding materialis particularly high in prestigious operations and expensive boardingsites where, except for their exercise periods, the horses are normallyconfined in a stall. These stalls must be kept in top condition byfrequent cleaning and wood shavings are utilized plentifully for healthas well as aesthetic and show purposes.

In addition, golf course sand bunkers may be built in a wide variety ofsizes, shapes, and contours. Such golf course bunkers may be constructedto include sections having a relatively steep surface and comprising asloped zone or area included within portions of the sand contourthereof. In such sand bunkers, keeping the sand free from contaminationand raked smoothly may be a daily task of golf course ground-maintenancecrews. Such bunker depressions in the golf course tend to naturallyattract debris, such as stones and rocks from under the sand, treedebris, such as needles, cones and leaves, and also the crumbling and/ordisplacement of the edges from golfers stepping in and out of them. Atthese and other times, maintenance crews may be tasked with sifting thedebris from the sand, as well as the lesser duty of merely raking thesand surface. Accordingly, it would be desirable to have a rake or fork,which not only helps maintain the sloped zones or areas within thebunker themselves, but also removes debris from the bunker.

It can be appreciated that a sifting fork as described herein can beused to sift and/or separate any wanted from unwanted material,including such uses as archeological digs, beachcombing and the like.

SUMMARY OF THE INVENTION

In accordance with one embodiment, a rake comprises: a handle; and arake head comprising: a frame having a neck dimensioned to receive oneend of the handle; a plurality of tines, the plurality of tinescomprising: a movable inner tine section, the movable inner tine sectionhaving a first movable inner tine section, a second movable inner tinesection and at least one fixed inner tine between the first movableinner tine section and the second inner tine section; and a fixed outertine section on each side of the inner section; a support memberextending across the plurality of tines, the support member comprising aplurality of supports positioned between the tines; and a screeningmaterial, which separates a wanted material from an unwanted material.

In accordance with another embodiment, a rake comprises: a handle, thehandle having a grip, which includes an upper portion and a lowerportion, the upper portion and the lower portion being at an angle toone another; and a rake head comprising: a frame having a neckdimensioned to receive one end of the handle; and a plurality of tines;and a motor assembly, wherein the motor assembly imparts a sinusoidalmotion to the plurality of tines.

In accordance with a further embodiment, a rake comprises: a handle, thehandle having a grip, which includes an upper portion and a lowerportion, the upper portion and the lower portion being at an angle toone another; and a rake head comprising: a frame having a neckdimensioned to receive one end of the handle; a plurality of tines, theplurality of tines comprising: a movable inner tine section, the movableinner tine section having a first movable inner tine section, a secondmovable inner tine section and at least one fixed inner tine between thefirst movable inner tine section and the second inner tine section; anda fixed outer tine section on each side of the inner section; a pair ofhinges positioned between the first and second movable inner tinesections and the outer tine sections; a pair of hinges positionedbetween the first and second movable inner tine sections and the atleast one fixed inner tine; a support member extending across theplurality of tines, the support member comprising a plurality ofsupports positioned between the tines, wherein the outer tine sectionsare attached to and extend from the frame, and the inner tine section isnot fixedly attached to the frame except by the hinge; and at screeningmaterial, which separates a wanted material from an unwanted material; amotor assembly; and a leverage assembly, wherein the leverage assemblyis attached to at least a portion of the movable inner tine section atone end and moveably attached to the handle at a second, wherein themotor assembly imparts a sinusoidal motion to the plurality of tines viathe leverage assembly.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in greater detail with reference tothe preferred embodiments illustrated in the accompanying drawings, inwhich like elements bear like reference numerals, and wherein:

FIG. 1 shows a perspective view of a motion assisted manure fork havingan external power source.

FIG. 2 shows a perspective view of the fork head of the motion assistedmanure fork as shown in FIG. 1.

FIG. 3 shows a cross-sectional view of the handle portion of the motionassisted manure fork with an internal power source.

FIG. 4 shows a perspective view of the fork head of a motion assistedmanure fork according to a further embodiment.

FIG. 5 shows a perspective view of a manure fork with a top mountedmotor assembly.

FIG. 6 shows a perspective view of a manure fork with a bottom mountedmotor assembly.

FIG. 7 shows a perspective view of a manure fork in accordance withanother embodiment.

FIG. 8 shows a perspective view of a motion assisted manure fork inaccordance with a further embodiment.

FIG. 9 shows a side view of the motion assisted manure fork as shown inFIG. 8.

FIG. 10 shows a perspective view of a motion assisted manure fork inaccordance with another embodiment.

FIG. 11 shows a perspective view of the fork head of the motion assistedmanure fork as shown in FIG. 10.

FIG. 12 shows a perspective view of the manure fork with a bottommounted leverage assembly as shown in FIG. 10.

FIG. 13 shows a perspective view of a manure fork with a leverageassembly in accordance with another embodiment.

FIG. 14 shows a perspective view of a fork head of a motion assistedsifting fork in accordance with a further exemplary embodiment.

FIG. 15 shows a side view of a grip handle or handle of a motionassisted sifting fork in accordance with another exemplary embodiment.

FIG. 16 shows a bottom view of the grip handle or handle of a motionassisted sifting fork as shown in FIG. 15.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows a perspective view of a motion assisted manure fork 10. Asshown in FIG. 1, the motion assisted manure fork 10 includes a handle 20and a fork head 30. The handle 20 includes a first end 22 and a secondend 24, which is attachable to the fork head 30. The first end 22 of thehandle 20 preferably includes an external power source 72 and a switch74. The power source 72 is preferably detachable and mounted on the endof the handle to facilitate servicing. The switch 74 preferably includesan on/off position 75, and can include a variable speed control switch77. The switch 74 can be a rotary switch, a slide switch a triggerswitch or other suitable switch, which controls the on/off function of amotor assembly 70 (FIG. 3), as well as the variable velocity andfrequency at which the motor assembly 70 can impart a sinusoidal motionto a plurality of tines 36 in such a manner that the tines 36 can bedisplaced from their equilibrium or resting position to a periodic orcyclic motion. Furthermore, it can be appreciated that by varying thedisplacement, velocity, acceleration and/or frequency of the tines 36,the sinusoidal motion imparted to the tines 36 can include oscillation,vibration, reciprocating, or a pendulum motion.

The fork head 30 comprises a neck 31, which receives the second end 24of the handle 20, a frame 32, and a plurality of tines 36. The pluralityof tines 36 extend from the frame 32 at a first or upper end 41 to asecond or lower end 47, wherein each of the plurality of tines 36 has atip 46. The plurality of tines 36 is divided into a movable inner tinesection 53 and a fixed outer tine section 51 between which there is aconnecting hinge 37. The plurality of tines 36 typically include atleast one support member 34, extending across the width of the pluralityof tines 36. The hinge 37 location separates the inner tine section 53into an upper segment 86 and a lower segment 88 (FIG. 2). At least onesupport member 34 comprises a plurality of supports 35 positionedbetween the tines 36 to provide strength to the fork head 30 during use.As shown in FIG. 1, it can be appreciated that additional supportmembers 34, can be positioned on the outer tine section 51. In addition,the frame 32, and the outer tine section 51 can be curved or angledupward to form a scoop or basket-like fork head 30 to assist with thegathering and sifting of the manure from the shavings, sawdust or othersiftable material.

As shown in FIG. 1, the handle 20 is preferably an elongated hollowtubular or elliptical member 21 having an interior surface 23 and anexterior surface 25 (FIG. 3). The handle 20 is preferably rigid and canbe molded from a lightweight fiberglass material, aluminum, or asynthetic plastic or rubber material. It can be appreciated that anysuitable material can be used as long as the material provides thehandle 20 with sufficient rigidity to lift upwards of 35 lbs. Theinterior surface 23 of the handle 20 preferably houses an electricalcord or wire 76 connecting the power source 72 to the motor assembly 70and may also house an integral power source 72. The handle 20 alsopreferably includes a control system 74 located on an exterior surface25 of the handle 20.

As shown in FIG. 1, the power source 72 and the control system 74 arepreferably positioned near the first end 22 of the handle 20. It can beappreciated that the power source 72 and control system 74 does not needto be at the same angle as the handle 20. The positioning of the powersource 72 and the control system 74 is not only based on ease of use andthe need to the have the controls nearest at least one hand of the user,but also assists with the balancing of the fork 10. It can beappreciated that the power source 72 and the control system 74 can beseparated and positioned at other location along the interior of thehandle or on the exterior 25 of the handle 20 at a suitable location,for example, in such case where the handle 20 is constructed of a solidmaterial, such as wood. Alternatively, the power source 72 and/orcontrol system 74 can be attached to the exterior 25 of the handle 20 ata midpoint between the first 22 and second ends 24.

The power source 72 is preferably a rechargeable power source in theform of a rechargeable battery or batteries, or secondary cells, whichcan be re-charged after they have been drained. This is preferablyperformed by applying externally supplied electrical current, in theform of a charger or recharger (not shown), which causes the chemicalchanges that occur in use to be reversed. It can be appreciated that therechargeable battery can be any suitable rechargeable device, includingbut not limited to any suitable “dry cell” type battery, includingnickel-cadmium (NiCd), nickel metal hydride (NiMH), and lithium-ion(Li-Ion) cells. Alternatively, a disposable battery source can be used,such as standard alkaline or lithium battery. It can be appreciated thatin any embodiment of the invention, for convenience of batteryrecharging, a commercially available charger can be made and arranged toconveniently contact and charge the power source 72 in place from the ACpower line between usage events in the well manner of well-knownrecharging cordless tools such as hand drills and power screw drivers.The handle 20 and/or power source 72 will preferably have a connection73 (FIG. 3) dimensioned to receive an AC power line to recharge thepower source 72 as needed. It can also be appreciated that the batterymay be removed altogether to be serviced or recharged at a remotecharging station.

If a standard alkaline type or other replaceable battery is used, inaccordance with another embodiment, the first end 22 can include aremovable cap 28 (FIG. 3), which can be removed to access the powersource 72. The removable cap can include a set of thread, which match acorresponding thread pattern on the exterior surface 24 of the first end22 of the handle 20. It can be appreciated that in an alternativeembodiment, the power source 20 can include any suitable power sourceincluding but not limited to gasoline or a gas powered motor. Forexample, a gas-powered motor would include a shaft or other meansextending through the handle 20 to a crankshaft and/or connecting rod.

FIG. 2 shows a perspective view of the fork head of the motion assistedmanure fork 10 as shown in FIG. 1. As shown in FIG. 2, the fork head 30includes a series or plurality of tines 36, which includes an inner tinesection 53 and an outer tine section 51. The angle 49 separates theplurality of tines of the outer section 51 into the upper segment 42 andthe lower segment 44. The outer section 51 of tines 36 on each end ofthe frame 32 are attached to and extend from the frame 32. The innertine section 53 of tines 36 are not fixedly attached to the frame 32,but are attached to the outer tine section 51 by the hinge 37. It can beappreciated that between the inner tine section 53 and the outer sectionof tines 51 as well as the frame 32 of the fork head 30, a space or slot38 there between can be present. Alternatively, the space or slot 38between the frame 32 and the upper segment 86 of the inner tine section53 of tines 36 can be filled with an elastic material or any othersuitable material, wherein upon an imparting of a force to the uppertine segment 86 of the inner tine section 53, a sinusoidal motion can beimparted to the tines 36 in such a manner that the tines 36 aredisplaced from their equilibrium and/or a resting position. The hinge 37can be made of any suitable material, including an elastomeric material,plastic, a steel wire encased in plastic. Alternatively, the hinge 37can be a bearing, a bushing combination, or other suitable rodcombination.

The upper or first segment 42 of the outer tine section 51 is connectedto the frame 32 of fork head 30 at a first or upper end 41 and to theangle of inclination 49 at a lower end. The lower segment 44 of theouter tine section 51 is connected to the angle of inclination 49 andextends to a second or lower end 47. At the second or lower end 47, thetines 36 have a tip 46. The tip 46 of the tines 36 can be a round tip, apointed tip, a flat tip, a flattened surface or other end. The fork 30is preferably made from a plastic material, such as polycarbonate.

As shown in FIG. 2, the plurality of tines 36 typically include at leastone support member 34, extending across the width of the plurality oftines 36. The support member 34 comprises a plurality of supports 35positioned between the tines 36 to provide strength to the fork head 30during use. In addition, as shown in FIG. 2, additional support members34 can be positioned across the tines 36 of the outer tine section 51 toprovide additional support to the fork head 30. The additional supportmembers 34 preferably positioned along the angle of inclination 49,however, they can be positioned along any suitable portion of the outertine section 51. In addition, the upper and lower 42, 44 segments of theouter tine section 51 can include a curved or angled outer tine member95, which is curved or angled upward to form a scoop or basket-like forkhead 30 to assist with the gathering and sifting of the manure from theshavings, sawdust or other siftable material.

The support member 34 typically coincides with a hinge 37 of the forkhead 30. It can be appreciated that the support member 34 does notnecessarily coincide with the hinge 37. It can also be appreciated thatwhere the upper segment 42 and the lower segment 44 of the plurality oftines 36 transitions from a first position, which is in a relativelyparallel relationship to the handle 20 to a second position at the angleof inclination 49, wherein the upper and lower segments 42, 44 of thetines 36 are at an angle to one another, there may or may not be a hinge37 or support member 34 at that point. The plurality of tines 36preferably have an over length 64 of 10 to 18 inches and more preferably11 to 15 inches. The angle of inclination 49 separates the plurality oftines into the upper segment 42 having an overall length 60 of betweenabout 2 to 4 inches and the lower segment 44 having an overall length 62of between about 8 to 16 inches.

The motor assembly 70 is preferably located within the interior surface23 of the handle 20 at or near the second end 24 of the handle 20.However, it can be appreciated that in an alternative embodiment asshown in FIGS. 5, 6 and 8, the motor assembly 70 can be mounted on theexterior 25 of the handle 20 either adjacent to the handle 20 or on theupper tine segment 86 of the inner tine section 53. As shown in FIG. 2,the motion activation assembly 80 of the motor assembly 70 preferablyextends beyond the second end 24 of the handle 20 and is attached fromthe upper tine segment 86 to the second end 22 of the handle 20 by asuitable connection assembly 81 (FIG. 4). The motor assembly 70 ispreferably an electric motor having a variable speed system at themotion activation shaft ranging from about 2 Hz to 60 Hz and morepreferably a variable speed range of 2 to 30 Hz.

It can be appreciated the variable speed function of the motor assembly70 and the control system 74 can include a defined speed function, suchas a single, a dual, tri, quad speed system. For example, the variablespeed function can include a 2-Hz setting and a 12-Hz setting. It can beappreciated that depending on the configuration of the motion activationassembly 80, the connection assembly 81 and the connecting member 83that up to approximately 10 Hz, the motor assembly 70 will impart asinusoidal motion, which is of a general oscillating or pendulum motion(i.e., an up and down motion) to the tines 36. Meanwhile at greater than10 Hz, the motor assembly 70 imparts a sinusoidal motion, which willimpart a vibrating motion, typically with a oscillation movementthereto, wherein the tines 36 appear to move in an up and down and aside to side motion.

FIG. 2 shows a perspective view of a manure fork 10. As shown in FIG. 2,the motor assembly 70 is preferably located within the neck 31 of thefork head 30 and includes a connection assembly 81, which is attached orsecured to the upper tine segment 86 of the inner tine section 53, Themotion activation assembly 80 preferably includes a roller bearing 84(FIGS. 3 and 4) located within a slot of the connection assembly 81, andbridging the gap 38 between the frame 32 and the upper tine segment 86.The fork as shown in FIGS. 1 and 2, provides a mechanically driven ormotorized manure fork with medium displacement (MD) and a low to mediumfrequency (LF/MF). In operation or use, the fork 10 is typically bestsuited for smaller and medium sized compressed and bagged shavings,sawdust and pellets.

As shown in FIG. 2, the motor assembly 70 is preferably enclosed withinthe neck 31 of the fork head 32. However, it can be appreciated that themotor assembly 70 can be enclosed within the second end 24 of the handle20. The motor assembly 70 preferably comprises an electric or othersuitable motor with a motion activation assembly 80 for imparting asinusoidal motion to the tines 36 via the upper tine segment 86 of theinner tine section 53. The upper tine segment 86 of the inner tinesection 53 provides support for the first or upper ends 41 of the innertine section 53 and also provides a location or point for attachment ofthe connection assembly 81 to the motion activation assembly 80 of themotor assembly 70. The connection assembly 81 preferably includes aconnection assembly 81 to the motion activation assembly 80, whichimparts the sinusoidal motion from the motor assembly 70 to the forkhead 30 and the plurality of tines 36.

The connection assembly 81 is preferably connected to a bearing 84 andcam motion activation assembly 80 mounted to the motor assembly 70, Asshown in FIG. 2, the connection assembly 81 is attached to the uppertine segment 86 of the inner tine segment 53. The upper tine segment 86forms the first or upper end 41 of the inner tine section 53 of tines 36near the portion of the fork 10, wherein the handle 20 connects to thefork head 30. The upper tine segment 86 of the inner tine section 53 andthe frame 32 are preferably separated by a gap, space or slot 38. Thegap, space, or slot 38 is preferably between about a 1/16 of inch toabout ⅝ of inch and more preferably about 1/16 to ⅛ of an inch. However,it can be appreciated that the gap, space, or slot 38 can be filled withan elastic material or other suitable material, which can be placedbetween the frame 32 and the upper tine segment 86.

As shown in FIG. 2, the handle 20 is preferably connected to the forkhead 30 at a neck 31 on the fork frame 32. The handle 20 can beconnected to the fork frame 32 via the neck 31 by clamping, by bolting,by threading, by rivets, by gluing, by force fit or any other knownmeans,

In one embodiment, the motor assembly 70 and the motion activationassembly 80 including the connection assembly 81 and bearing 84 impart asinusoidal motion to the tines of the fork 36, which can include aseries of periodic cycles having any or a combination of the following:(1) Low displacement (LD) wherein the tips 46 of the tines 36 move lessthan ½ inch up and down; (2) Medium displacement (MD) wherein the tips46 of the tines 36 move up and down ½ to 2 inches; and (3) Highdisplacement (HD) wherein the tips 46 of the tines 36 move up and down 2inches or more. In addition, the frequency of the tips 46 can includevariable cycles or frequencies including: (1) Low frequency (LF) whereinthe tips 46 are moving up and down at fewer than 10 Hz; (2) Mediumfrequency (MF) wherein the tips 46 are moving up and down and/orvibrating at 10 Hz to 35 Hz; and (3) High frequency (HF) wherein thetips 46 are actively vibrating and/or wildly shaking at 35 Hz to 60 Hz.The configuration of the fork 10, fork head 30 and position of the motorassembly 70 imparts the desired displacement and frequency to the tines36 depending on the use of the fork 10 and the user's preferences. Itcan be appreciated that the above-mentioned motion of the tines 36 areonly examples of one embodiment, and that based on the sinusoidal motiongeneration of the motor 70 and motion activation assembly 80, thatvarying any of the following variables, displacement, velocity,acceleration, and/or frequency can impart different sinusoidal motionsand/or movements into the tines 36 of the fork 10. It can also beappreciated the varying the shape, size, length, or composition of thetines 36, can be made to effect their natural resonant frequency. It canbe appreciated that vibrations of varying frequencies are also beingapplied to the outer portions, frame 32 and support members of the fork30.

FIG. 3 shows a perspective view of the handle end of the motion assistedmanure fork 10 with the power source 72 located within the handle 20. Asshown in FIG. 3, the handle 20 is preferably an elongated hollow tubularor elliptical member 21 having an interior surface 23 and an exteriorsurface 25. The handle 20 is preferably rigid and can be molded from alightweight fiberglass material, aluminum, or a synthetic plastic orrubber material. The neck 31 of the fork head 30 houses the motorassembly 70. The handle 20 houses an electrical cord or wire 76connecting the power source 72 to the motor assembly 70 and may alsohouse an integral power source 72. The handle 20 also preferablyincludes a control system 74 located on an exterior surface 25 of thehandle 20. The control system 74 can include an on/off switch 75 and anoptional speed control mechanism 77 in the form of a rotary dial, aslide switch, a trigger type device or other suitable mechanism toprovide the fork 10 with a variable speed system. It can be appreciatedthat the on/off switch 75 and the variable speed control mechanism 77can be combined into a single unit in the form of a slide switch,trigger, rotary type device or other suitable design.

FIG. 4 shows a perspective view of a fork head 30 in accordance withanother embodiment. As shown in FIG. 4, the fork head 30 includes aseries or plurality of tines 36, the upper or first segment 42 of theouter tine section 51 is connected to the frame 32 of fork head 30 at afirst or upper end 41 and to the angle of inclination 49 at a second orlower end 43. The lower segment 44 of the outer tine section 51 isconnected to the angle of inclination 49 and extends to a second orlower end 47. At the second or lower end 47, the tines 36 have aterminus or tip 46. The terminus or tip 46 of the tines 36 can be around tip, a pointed tip, a flat tip, a flattened surface or other end.

The distance 66 of the upper or first segment 86 from the frame 32 tothe hinge line 39 relative to the distance 68 of lower or second segment88 from the hinge line 39 to the tip 46 of the tines 36 will typicallyhave a ratio of between about 1 to 5 and 5 to 5. For example, thedistance 66 from the frame 32 to the hinge 37 will preferably be betweenabout 1 to 6 inches and more preferably between 2 and 4 inches with thedistance 68 from the hinge 37 to the tip 46 of the tines 36 between 6and 12 inches and more preferably between about 7 and 10 inches. Thetines 36 will preferably have an overall length 64 of about 10 to 18inches and more preferably an overall length 64 of about 11 to 15inches. The tines 36 will preferably number between 6 and 30 and havinga width of about 4 to 24 inches, and more preferably havingapproximately 16 to 20 tines and having a width of 12 to 18 inches, andmost preferably comprising 18 tines with a width of 15 inches.

The upper or first segment 42 is typically substantially parallel to thehandle 20 and the lower or second segment 44 forms an angle ofinclination 49 with the upper or first segment 42 (FIG. 9). This angleof inclination 49 can be between about 30 degrees and 60 degrees andmore preferably the angle of inclination 49 is between about 35 degreesand 45 degrees. It can be appreciated that the hinge 37 can be movedeither forward (i.e., closer to the tip 46) or backward (i.e., towardsthe frame 32) without moving the support member 34 between the upper andlower segments 86, 88 or angle of inclination 49. In this embodiment asshown in FIG. 4, wherein the support member 34 and the angle ofinclination 49 do not coincide with one another, it can be appreciatedthat the fork head 30 can show improved sifting ability since the lowpoint of the fork head 30 during use is typically at the intersection ofthe angle of inclination. It is to be appreciated that the hinge 37 canbe at any point between the inner tine section 53 and the outer tinesection 51 and may not necessarily coincide with the support member 34or the low angle of inclination 49. The hinge 37 is generally located ina position to optimize the motion between the upper segment 86 and thelower segment 88 of the inner tine section 53 to enhance the siftingability of the fork head 30.

The tines 36 are preferably spaced apart at a distance 69 of between0.125 to 1.25 inches, and more preferably between 0.25 to 0.75 inches.The optimal distance 69 is preferably selected based on the size, shapeand consistency of the bedding being cleaned. In addition, the length ofthe plurality of tines 36 in the upper segment 86 to the plurality oftines 36 in the lower segment 88 of the inner tine section 53 can vary,the upper segment 86 having a length of 0 to 6.0 inches and a lowersegment 88 having a length of 14.0 to 6.0 inches in length, which arepreferably at a ratio from 1 to 5 to 5 to 5, wherein the upper segment86 and the lower segment 88 are separated by the hinge 37. In addition,the length of the plurality of tines 36 in the outer tine section 51 inthe upper segment 42 to the plurality of tines 36 in the lower segment44 can be at a ratio of 1 to 5 to 5 to 5, wherein the upper segment 42and the lower segment 44 are separated by the angle of inclination 49.In addition, it can be appreciated that the distance 69 between theplurality of tines 36 can differ between the upper and lower segments42, 44 of the outer tine section 51, the upper or lower segments 86, 88of the inner tine section 53. For example, in one embodiment, thedistance 69 between the tines 36 of the upper segment 86 can be betweenabout 0.125 and 1.25 of an inch, with the distance 69 between the tines36 of the lower segment 88 are between 0.125 and 1.25 inches.

FIG. 5 shows a perspective view of the motion assisted manure fork 10having a top mounted motor assembly 70 connected directly to the uppertine segment 86 of the inner tine section 53. The motor assembly 70 isattached to the upper tine segment 86 of the inner tine section 53 atone end and includes a connection assembly 81, which attaches the motionactivation assembly 80 of the motor assembly 70 to the handle 20 or neck31 of the fork head 30. The motion activation assembly 80 includes aflexible or rigid connecting member 83, for attaching the handle 20 tothe motion activation assembly 80. The connecting member 83 ispreferably a strap. However, it can be appreciated that the connectingmember 83 can be a clamp, a flexible band, a connecting rod or othersuitable connector.

In operation, the fork 10 as shown in FIG. 5 having a top mounted motorassembly 70, which is fixedly attached to the upper tine segment 86 ofthe inner tine section 53 and a flexible or movable connection to theframe 32 or handle 20 can provide an inertia related drive for highdisplacement (HD) using a pendulum weight effect with the motor assembly70. In addition, the fork 10 provides a motor driven or mechanicallydriven system for sustaining a sinusoidal motion from the motor assembly70 through the connecting member 83, which provides for low displacement(LD) while operating at low to high frequencies (LF to HF). Typically,the top mounted motor assembly 70 is best suited for very large shavingswith a structure (i.e., a mixture of manure and shavings) that isdifficult to separate. However, it can be appreciated that a top mountedmotor assembly 70 can be used with smaller compressed and baggedshavings, sawdust, or pellets.

FIG. 6 shows a perspective view of a manure fork with a bottom mountedmotor assembly 70. As shown in FIG. 6, the bottom mounted motor assembly70 is attached to the neck 31 of the frame 32 and/or the second end 24of the handle 20 of the fork 10. The motor assembly 70 preferablyincludes a connection assembly 81, which is attached to the upper tinesegment 86 of the inner tine section 53. The connection assembly 81 alsoincludes either a rigid or flexible connecting member 83. The connectingmember 83 is preferably a strap. However, it can be appreciated that theconnecting member 83 can be a clamp, a flexible band, a connecting rodor other suitable connector. In operation or use, the bottom mountedmotor assembly 70 combines a mechanically driven or motor assisted fork10 with low displacement and low to high frequencies. The bottom mountedmotor assembly 70 is typically best suited for pellets, sawdust, orsmaller compressed and bagged shavings.

FIG. 7 shows a perspective view of a manure fork 10. As shown in FIG. 7,the motor assembly 70 is preferably a top or bottom mounted and impartsa sinusoidal or vibrating motion to the fork head 30. In thisembodiment, the motor assembly 70 does not include a connection assembly81, which is attached or secured to the upper tine segment 86 of theinner tine section 53. Instead, the motor assembly 70 and the motoractivation assembly 80 includes a cam or other suitable device, whichimparts a motion to the fork head 30, which causes the plurality oftines 36 to vibrate. The fork 10 as shown in FIG. 7, provides amechanically driven or motorized manure fork with medium displacement(MD) and a low to medium frequency (LF/MF). In operation or use, thefork 10 is typically best suited for smaller and medium sized compressedand bagged shavings, sawdust and pellets.

It can be appreciated that the forks 10 as shown in FIGS. 5-7 can bemodified to provide from low to high displacement and low to highfrequency depending on the position of the motor assembly 70 and themotion activation assembly 80 including a variety of connectionassemblies 81 and/or connecting members 83, including clamps, straps,flexible bands, a connecting rod, bearings 84, or other suitableconnectors. It can be appreciated that in another embodiment, the gap 38between the frame 32 and the motion activation assembly 80 can be filledand/or eliminated and a motor assembly 70 can be attached to the handle20, neck 31 and/or frame 32 of the fork head 30 with a suitable rotatingcam and/or member, wherein the motor assembly 70 imparts a vibrating orshaking sensation to the tines 36 support members 34 and the frame 32 ofthe fork head 30.

FIG. 8 shows a perspective view of a motion assisted manure fork inaccordance with another embodiment. As shown in FIG. 8, the fork 10includes the motion assisted manure fork 10 comprises a handle 20 and afork head 30 with a motion assisted weight system 130. As shown, thefork head 30 comprises a neck 31, which receives the second end 24 ofthe handle 20, a frame 32, and a plurality of tines 36. The upper orfirst segment 42 of the outer tine section 51 is connected to the frame32 of fork head 30 at a first or upper end 41 and to the angle ofinclination 49 at a second or lower end 43. The lower segment 44 of theouter tine section 51 is connected to the angle of inclination 49 and ata second or lower end 47, the tines 36 have a tip 46. The tip 46 of thetines 36 can be a round tip, a pointed tip, a flat tip, a flattenedsurface or other end. The fork 30 is preferably made from a plasticmaterial, such as polycarbonate. The fork 10 also includes amotion-assisted weight system 130, which comprises a support member 102attached to the upper tine segment 86 of the inner tine section 53.

The support member 102 preferably includes an angular support 104. Theangular support 104 includes a proximal or first end 106 attached to thesupport member 102 and a distal or second end 106 with a movableweighted member 132 attached to the distal end 106 of the angularsupport 104. The movable weighted member 132 comprises a weight 134having an opening 136, which is configured to be movable along thedistal end 108 of the angular support 104. The movable weighted member132 also includes a screw or other device 138 to secure the weightedmember 132 to the angular member 104. The angular support 104 can alsoinclude an optional elastic member 120, in the form of a spring 122 orother suitable material to dampen the pendulum motion of the weightedassembly. In addition, the handle 20 can also include a stop 124,preferably of elastic or shock absorbing material, which controls themotion and/or movement of the movable weighted member 132 during use. Inuse, the fork 10 as shown in FIG. 8, is a human driven fork, wherein theforce is provided by the user to impart motion to the movable weightedmember 132. The movable weighted member 132 imparts a pendulum likemotion to the tines 36, wherein the tines 36 will move upward anddownward, rotating around the hinge 37, from the torque imparted to theupper tine member 86 from the movable weighted member 132. The forceimparted to the upper tine member 86 by the weighted member 132 producesa twisting motion to the flexible hinge 37. The hinge 37 acts like aspring and rebounds at the end of its travel providing inertia for thecontinued movement of the plurality of tines 36 in an upward anddownward motion.

FIG. 9 shows a side view of the motion assisted manure fork 10 as shownin FIG. 8. As shown in FIG. 9, the upper or first segment 42 issubstantially parallel to the handle 20 and the lower or second segment44 forms a connecting angle 49 with the upper or first segment 42. Thisangle of inclination 49 can be between about 30 degrees and 60 degreesand more preferably the angle of inclination 49 is between about 45degrees and 60 degrees. In addition, the frame 32, the upper or firstsegment 42 of the outer tine section 51 and the lower segment 44 of theouter tine section 51 can be curved or angled upward to form a scoop orbasket-like fork head 30 to assist with the gathering and sifting of themanure from the shavings, sawdust or other siftable material,

As shown in FIG. 9, the fork head 30, wherein the upper or first segment42 is typically substantially parallel to the handle 20 and the lower orsecond segment 44 forms an angle of inclination 49 with the upper orfirst segment 42. It can be appreciated that the upper or first segment42 does not have to be substantially parallel to the handle 20 and thatthe handle's 20 angle of inclination 79 can be at a first angle 61 tothe handle 20. In addition, the lower segment 44 of tines 36 is at asecond angle 63 to the handle 20. The difference between the first andsecond angles 61, 63, (i.e., the angles of inclination 79, 49) can bebetween about 30 degrees and 60 degrees and more preferably is betweenabout 45 degrees and 60 degrees.

It can be appreciated that the use of sinusoidal motion in thedescriptions is not limiting and that the use of sinusoidal motion canalso include oscillation, vibration, and/or pendulum movement, since byvarying the displacement, velocity, acceleration or frequency there isan infinite variety of possible periodic cycles to move the tines 36,and that the different types of motor/inertia/pendulum/humancombinations can produce individual cycles for specific types ofstructures. In addition, it can be appreciated that the embodiments asdisclosed herein, is not limited to manure forks and can also beimplemented on any suitable device for shifting and/or separating itemsfrom one another. For example the embodiments could be used to separatefine humus from debris in a garden, could be used in beach combing toseparate sand from valuables and could even be used in archeology toseparate fragments from soil. It can also be appreciated that the tinelocations could be spaced in varying placements for specific purposeseven to the point that the desirable material stayed on the top of thefork, while the undesirable material sifted through.

FIG. 10 shows a perspective view of a motion assisted manure fork 10 inaccordance with another embodiment having a bottom mounted leverageassembly 150 (FIG. 12). As shown in FIG. 10, the motion assisted manurefork 10 includes a handle 20 and a fork head 30. The handle 20 includesa first end 22 and a second end 24, which is attachable to the fork head30. The first end 22 of the handle 20 preferably includes an internalpower source 72 and a variable speed control system 74. The controlsystem 74 can be a rotary switch, a slide switch, a trigger switch orother suitable switch, which controls the on/off function of a bottommounted leverage assembly 150, as well as the variable velocity andfrequency at which the leverage assembly 150 can impart a sinusoidalmotion to a plurality of tines 36 in such a manner that the tines 36 canbe displaced from their equilibrium or resting position to a periodic orcyclic motion. It can be appreciated that the control system 74 can betop mounted with a thumb controlled switch or bottom mounted with afinger controlled switch. Furthermore, it can be appreciated that byvarying the displacement, velocity, acceleration and/or frequency of thetines 36, the sinusoidal motion imparted to the tines 36 can includeoscillation, vibration, or a pendulum motion.

The fork head 30 comprises a neck 31, which receives the second end 24of the handle 20, a frame 32, and a plurality of tines 36. The pluralityof tines 36 extend from the frame 32 at a first or upper end 41 to asecond or lower end 47, wherein each of the plurality of tines 36 has atip 46, The plurality of tines 36 is divided into a movable inner tinesection 53, which is comprised of a first inner movable tine section 152and a second inner tine section 154 with a fixed inner tine section 156between the first and second inner movable tine sections 152, 154. Thefixed inner tine section 156 includes at least one tine 36, which isfixedly attached to the frame of the fork head 30. The fork head 30 alsoincludes a fixed outer tine section 51 on each side of the movable innertine section 53. The plurality of tines 36 typically includes at leastone support member 34, extending across the width of the plurality oftines 36. A plurality of hinges 37 separates the first and second innertine sections 152, 154 from the fixed inner tine section 156 and thefixed outer tine sections 51. The leverage assembly 150 also includes afixed connection assembly 158, which is attached to the inner tinesection 53.

As shown in FIG. 10, the handle 20 is preferably an elongated hollowtubular or elliptical member. The handle 20 is preferably rigid and canbe molded from a lightweight fiberglass material, aluminum, or asynthetic plastic or rubber material. It can be appreciated that anysuitable material can be used as long as the material provides thehandle 20 with sufficient rigidity to lift upwards of 50 lbs. It can beappreciated that the use of a fixed inner tine section 156 providesadded rigidity to the fork head 30.

The power source 72 is preferably a rechargeable power source in theform of a rechargeable battery or batteries, or secondary cells, whichcan be re-charged after they have been drained. This is preferablyperformed by applying externally supplied electrical current, in theform of a charger or recharger (not shown), which causes the chemicalchanges that occur in use to be reversed. It can be appreciated that therechargeable battery can be any suitable rechargeable device, includingbut not limited to any suitable “dry cell” type battery, includingnickel-cadmium (NiCd), nickel metal hydride (NiMH), and lithium-ion(Li-Ion) cells. Alternatively, a disposable battery source can be used,such as standard alkaline or lithium battery. It can be appreciated thatin any embodiment of the invention, for convenience of batteryrecharging, a commercially available charger can be made and arranged toconveniently contact and charge the power source 72 in place from the ACpower line between usage events in the well manner of well-knownrecharging cordless tools such as hand drills and power screw drivers.The handle 20 and/or power source 72 will preferably have a connection73 (FIG. 3) dimensioned to receive an AC power line to recharge thepower source 72 as needed. It can also be appreciated that the batterymay be removed altogether to be serviced or recharged at a remotecharging station,

If a standard alkaline type or other replaceable battery is used, inaccordance with another embodiment, the first end 22 can include aremovable cap 28, which can be removed to access the power source 72.The removable cap can include a set of thread, which match acorresponding thread pattern on the exterior surface of the first end 22of the handle 20. It can be appreciated that in an alternativeembodiment, the power source 20 can include any suitable power sourceincluding but not limited to gasoline or gas powered motor.

FIG. 11 shows a perspective view of the fork head 30 of the motionassisted manure fork 10 as shown in FIG. 10. As shown in FIG. 11, thefork head 30 includes a series or plurality of tines 36, which includesa movable inner tine section 53 and a fixed outer tine section 51. Themovable inner tine section 53 is comprised of the first inner movabletine section 152 and the second inner tine section 154 with the fixedinner tine section 156 between the first and second inner movable tinesections 152, 154. The fork head 30 also includes a fixed outer tinesection 51 on each side of the movable inner tine section 53. The outersection 51 of tines 36 on each end of the frame 32 is attached to andextends from the frame 32. The inner tine section 53 of tines 36 is notfixedly attached to the frame 32, but is attached to the outer tinesection 51 by the hinge 37. It can be appreciated that between the innertine section 53 and the outer section of tines 51 as well as the frame32 of the fork head 30, a space or slot 38 there between can be present.Alternatively, the space or slot 38 between the frame 32 and the uppersegment 86 of the inner tine section 53 of tines 36 can be filled withan elastic material or any other suitable material, wherein upon animparting of a force to the upper tine segment 86 of the inner tinesection 53, a sinusoidal motion can be imparted to the tines 36 in sucha manner that the tines 36 are displaced from their equilibrium and/or aresting position. The hinge 37 can be made of any suitable material,including an elastomeric material, plastic, a steel wire encased inplastic. Alternatively, the hinge 37 can be a bearing, a bushingcombination, or other suitable rod combination.

As shown in FIG. 11, the plurality of tines 36 typically include atleast one support member 34, extending across the width of the pluralityof tines 36. The support member 34 comprises a plurality of supports 35positioned between the tines 36 to provide strength to the fork head 30during use. The support member 34 typically coincides with a hinge 37 ofthe fork head 30. It can be appreciated that the support member 34 doesnot necessarily coincide with the hinge 37. The plurality of tines 36preferably have an over length 64 of 10 to 18 inches and more preferably11 to 15 inches.

FIG. 12 shows a perspective view of the manure fork 10 with a bottommounted leverage assembly 150 as shown in FIG. 10. However, it can beappreciated that the leverage assembly 150 can be mounted on an upper ortop surface of the handle 20 or on either side of the handle 20 withoutdeparting from the present invention. As shown in FIG. 12, the bottommounted leverage assembly 150 is attachable on an underside or bottom ofthe handle 20 in the vicinity of the second end 24 of the handle 20 ofthe fork 10. The leverage assembly 150 is an elongated member 151 havinga first end 153 and second end 155. The first end 153 of the elongatedmember 151 preferably includes a fixed connection assembly 158, which isattached to the upper tine segment 86 of the inner tine section 53. Thesecond end 155 of the elongated member 151 preferably includes aconnection assembly 160, which is attachable in the vicinity of thesecond end 24 of the handle 20. The connection assembly 160 includes amotion activation assembly 162 attached to the motor assembly 70 at oneend and to a connecting rod 164 or other suitable device or member atthe other end. In use, the motion activation assembly 162 and theconnecting rod 164 impart a sinusoidal motion to the plurality of tines36 via the leverage assembly 150.

As shown in FIG. 12, the fixed connection assembly 158 is attached tothe movable inner tines 53 with a suitable connector 159. The connector159 preferably extends across the fixed inner tine 156 to impart anoscillating motion into the movable inner tines 53. The motor assembly70 can be housed or contained within the leverage assembly 150, housedor contained within the handle 20, or housed or located in any suitableposition. In operation or use, the bottom mounted leverage assembly 150combines a mechanically driven or motor assisted fork 10 with variabledisplacement and variable frequencies. The bottom mounted leverageassembly 150 is typically best suited for pellets, sawdust, or smallercompressed and bagged shavings. However, it can be appreciated that byvarying the displacement and frequency with the variable control switch74, the bottom mount leverage assembly 150 can be used with other typesof bedding.

The motor assembly 70 preferably includes an electric motor having avariable speed system at the motion activation shaft ranging from about2 Hz to 60 Hz and more preferably a variable speed range of 2 to 30 Hz.The output shaft preferably operates at approximately 400 to 1200 RPMand more preferably at approximately 900 RPM with an overdrive or topend speed of approximately 1200 RPM to separate bedding, whichcorresponds to approximately 15 to 20 strokes per second. In addition,it can be appreciated that with an operation speed of betweenapproximately 400 to 1200 RPM, the tips of the tines 36 will have amovement of approximately 1.5 inches. It can be appreciated the variablespeed function of the leverage assembly 150 and the control system 74can include a defined speed function, such as a single, a dual, tri,quad speed system. For example, the variable speed function can includea 2-Hz setting and a 12-Hz setting. It can be appreciated that dependingon the configuration of the motion activation assembly 160, theconnection assembly 158 and the connecting member 159 that up toapproximately 10 Hz, the leverage assembly 150 will impart a sinusoidalmotion, which is of a general oscillating or pendulum motion (i.e., anup and down motion) to the tines 36. Meanwhile at greater than 10 Hz,the leverage assembly 150 imparts a sinusoidal motion, which will imparta vibrating motion, typically with a oscillation movement thereto,wherein the tines 36 appear to move in an up and down and a side to sidemotion.

FIG. 13 shows a perspective view of a manure fork 10 with a leverageassembly 150 in accordance with another embodiment. As shown in FIG. 13,the motion assisted manure fork 10 includes a handle 20 and a fork head30. The first end 22 (not shown) of the handle 20 preferably includes aninternal power source 72 (not shown) and a variable speed control system74 (not shown). The control system 74 can be a rotary switch, a slideswitch, a trigger switch or other suitable switch, which controls theon/off function of the leverage assembly 150, as well as the variablevelocity and frequency at which the leverage assembly 150 can impart asinusoidal motion to a plurality of tines 36 in such a manner that thetines 36 can be displaced from their equilibrium or resting position toa periodic or cyclic motion.

The fork head 30 comprises a neck 31, which receives the second end 24of the handle 20, a frame 32, and a plurality of tines 36. The pluralityof tines 36 extend from the frame 32 at a first or upper end 41 to asecond or lower end 47, wherein each of the plurality of tines 36 has atip 46. In contrast to the embodiments as shown in FIGS. 1, 2, 4, 6, 8,and 10-12, the plurality of tines 36 are fixed or attached to the frame32 of the fork head 30 and do not include a gap or space 38 as shown inthose FIGS. 1, 2, 4, 6, 8, and 10-12. In addition, the leverage assembly150 also includes a fixed connection assembly 158, which is attached tothe upper tine segment 86 of an inner tine section 53. In thisembodiment, the frame 32 of the fork head 30 is engineered andconfigured to act as a hinge 37, as the leverage assembly 150 imparts asinusoidal motion to the plurality of tines 36.

As shown in FIG. 13, the bottom mounted leverage assembly 150 isattachable in the vicinity of the second end 24 of the handle 20 of thefork 10. The leverage assembly 150 preferably includes a fixedconnection assembly 158, which is preferably attached to the upper tinesegment 86 of the inner tine section 53, and a connection assembly 160,which is attachable in the vicinity of the second end 24 of the handle20. It can be appreciated that the fixed connection assembly 158 can beattached to the plurality of tines 36, a portion of the frame 32 of thefork head 30 or other suitable portion of the fork head 30, wherein theleverage assembly 150 can impart a sinusoidal or other suitable motionto the plurality of tines 36. The connection assembly 160 preferablyincludes a motion activation assembly 162 and a connecting rod 164. Themotion activation assembly 162 is connected at one end to a motorassembly 70, and at the other end to a connecting rod 164 or othersuitable connection device or member. In use, the motion activationassembly 162 and the connecting rod 164 imparts a sinusoidal motion tothe plurality of tines 36 via the leverage assembly 150.

As shown in FIG. 13, the fixed connection assembly 158 is preferablyattached to the plurality of tines 36 with a suitable connector 159. Theconnector 159 preferably extends across a portion of the plurality oftines 36 flexing the frame 32 to impart an oscillating motion into thetines 36. The motor assembly 70 can be housed or contained within theleverage assembly 150, housed or contained within the handle 20, orhoused or located in any suitable position. In operation or use, thebottom mounted leverage assembly 150 combines a mechanically driven ormotor assisted fork 10 with variable displacement and variablefrequencies. The bottom mounted leverage assembly 150 is typically bestsuited for pellets, sawdust, or smaller compressed and bagged shavings.However, it can be appreciated that by varying the displacement andfrequencies with the variable control switch 74, the bottom mountleverage assembly 150 can be used with other types of bedding.

In addition, it can be appreciated that the inner tine section 53 andthe frame 32 in combination with one another can be engineered andconfigured to act as a hinge 37 or plurality of hinges 37, and incombination with the leverage assembly 150 imparts a sinusoidal motionto the plurality of tines 36.

FIG. 14 shows a perspective view of a fork head (or rake head) 30 havinga screening material 180 attached thereto in accordance with a furtherembodiment. As shown in FIG. 14, the fork head 30 includes a series orplurality of tines 36, the upper or first segment 42 of the outer tinesection 51 is connected to the frame 32 of fork head 30 at a first orupper end 41 and to the angle of inclination 49 at a second or lower end43. The lower segment 44 of the outer tine section 51 is connected tothe angle of inclination 49 and extends to a second or lower end 47. Atthe second or lower end 47, the tines 36 have a terminus or tip 46. Theterminus or tip 46 of the tines 36 can be a round tip, a pointed tip, aflat tip, a flattened surface or other end.

The distance 66 of the upper or first segment 86 from the frame 32 tothe hinge line 39 relative to the distance 68 of lower or second segment88 from the hinge line 39 to the tip 46 of the tines 36 will typicallyhave a ratio of between about 1 to 5 and 5 to 5. For example, thedistance 66 from the frame 32 to the hinge 37 will preferably be betweenabout 1 to 6 inches and more preferably between 2 and 4 inches with thedistance 68 from the hinge 37 to the tip 46 of the tines 36 between 6and 12 inches and more preferably between about 7 and 10 inches. Thetines 36 will preferably have an overall length 64 of about 10 to 18inches and more preferably an overall length 64 of about 11 to 15inches. The tines 36 will preferably number between 6 and 30 and havinga width of about 4 to 24 inches, and more preferably havingapproximately 16 to 20 tines and having a width of 12 to 18 inches, andmost preferably comprising 18 tines with a width of 15 inches.

The upper or first segment 42 is typically substantially parallel to thehandle 20 and the lower or second segment 44 forms an angle ofinclination 49 with the upper or first segment 42 (FIG. 9). This angleof inclination 49 can be between about 30 degrees and 60 degrees andmore preferably, the angle of inclination 49 is between about 35 degreesand 45 degrees. It can be appreciated that the hinge 37 can be movedeither forward (i.e., closer to the tip 46) or backward (i.e., towardsthe frame 32) without moving the support member 34 between the upper andlower segments 86, 88 or angle of inclination 49. In this embodiment asshown in FIG. 14, wherein the support member 34 and the angle ofinclination 49 do not coincide with one another, it can be appreciatedthat the fork head 30 can show improved sifting ability since the lowpoint of the fork head 30 during use is typically at the intersection ofthe angle of inclination. It is to be appreciated that the hinge 37 canbe at any point between the inner tine section 53 and the outer tinesection 51 and may not necessarily coincide with the support member 34or the low angle of inclination 49. The hinge 37 is generally located ina position to optimize the motion between the upper segment 86 and thelower segment 88 of the inner tine section 53 to enhance the siftingability of the fork head 30.

As shown in FIG. 14, the fork head 30 includes a screening material (orsieve or sifting material) 180, which is attached at a distal portion184 of the fork head 30 with a series of attachment members 182. Inaddition, the screening material 180 is preferably attachable to aproximal portion of the fork head 30 through at least one or moreopenings 192 on the proximal end of the movable inner tine section 38.The one or more openings 192 are configurable to receive an attachmentmember 182, which secures the screening material 180 to an upper surfaceof the fork head 30. It can be appreciated that the screening material180 can also be attachable to one or more edges of the fork 30 and/orthe proximal end of the fork head 30 by any suitable means. Inaccordance with an exemplary embodiment, the screening material 180 isconfigured to fit tightly within the fork head 30 (or basket portion)and/or adjacent to the plurality of tines 36. The attachment members 182can be any suitable fastener, rivet, hook, clamp, snaps and/or othersuitable device, which attaches the screening material 180 to an uppersurface (or connection positioned between the plurality of tines 36) ofthe fork head 30.

It can be appreciated that in accordance with an exemplary embodiment,rather than being attached to the fork head 30 with attachment members182, the screening material 180 can be molded within and/or part of thefork head 30. For example, a screening material 180 can be molded and/orpositioned between the respective pluralities of tines 36. In addition,it can be appreciated that rather than have a plurality of tines 36 asshown, each of the moveable inner tine section 38 can be configured witha pair of tines 36 on an outer edge thereof and screening material 180extending therebetween. Thus, by eliminating some of the plurality oftine 36, the fork head 30 will have improved sifting ability, sinceunneeded tines 36 will not prevent wanted material from passing throughthe screening material 180.

The screening material 180 is preferably a material, which acts as asieve, or sifter, and separates wanted elements (i.e., sand) fromunwanted material (i.e., leaves, tar sands, bottle caps, etc.) using awoven screen such as a mesh or net. The woven mesh or screen preferablyincludes a plurality of wires 188 running parallel to one another in onedirection and another plurality of wires 190 running perpendicular tothe plurality of wires 188. In accordance with an exemplary embodiment,the screening material (or sieve or sifting material) 180 is preferablyan aluminum, metal or steel and/or fiberglass mesh. It can beappreciated that the size or distance between the mesh material ispreferably selected based on the particle size distribution of theunwanted versus the wanted material. It can be appreciated that when themesh is shaken, the wanted material passes through the mesh while theunwanted material is retained on the mesh and/or screening material.

The screening material 180 preferably has a mesh size of approximately1/16 of an inch to approximately ¾ of an inch measured from one wire toanother in both a vertical and horizontal direction (and/or latitudinaland longitudinal direction). However, it can be appreciated that thesize and/or distances between wires can be based on the particledistribution of the wanted versus unwanted materials.

It can be appreciated that the screening material 180 is preferablyreplaceable and/or interchangeable, such that each fork head 30 isconfigurable to accept one or more different screening material 180,which is based on the size of both the wanted and unwanted elements. Forexample, with a sand type material as a wanted element or material, thescreening material 180 can have a smaller distance between the pluralityof wires as compared to wanted material or element having a greaterdiameter and/or width.

In accordance with an exemplary embodiment at a distal end of thescreening material 180, a support member 186 extends from one edge tothe other edge. The support member 186 is preferably a metal rod orsimilar type of material, which provide added strength to the distal endof the fork head 30 during use. For example, for sifting and cleaning ofbunkers (or sand traps) on a golf course of unwanted leaves and rocks,the distal end of the fork is inserted into the sand mixture and thewanted particles or sand are sifted thorough the mesh while the unwanteddebris including leaves and rocks are removed and disposed of into anappropriate location. As shown in FIG. 14, on the distal portion of thefork head 30, the tips 46 of the plurality of tines 36 are free to rakeor shape the sand as desired. It can be appreciated that in accordancewith an exemplary embodiment, from 0.5 inches to 3 inches, and morepreferably 1 to 2 inches of the plurality of tines 36 are not cover withthe screening material 180.

In accordance with another exemplary embodiment as generally shown inFIG. 2, the fork head 30 can include a plurality of tines 36 having asingle (or one) moveable inner tine section 38 and a plurality of fixedtines 36 on an outer edge thereof. It can be appreciated that themoveable inner tine section 38 preferably includes at least a pair ofouter tines 36 and a screening material 180 therebetween. For example,in accordance with an exemplary embodiment, the fork head 30 can includea moveable inner tine 38 having a screening material 180 between a pairof tines 36, and one or more fixed tines 36 on an outer edge of themoveable inner tine section 38. In accordance with an exemplaryembodiment, the fork head 30 having a single moveable inner tine section38 is approximately 3 to 6 inches in width and 4 to 12 inches in length.

FIG. 15 shows a side view of a grip (or grip handle) 200 of a motionassisted sifting fork 10 in accordance with another exemplaryembodiment. As shown in FIG. 15, the grip handle 200 includes a gripconfiguration, which allows the wrist of a user to be in “neutral” whenworking with the fork. It can be appreciated that by including anergonomically correct grip handle on the fork 10, the handle 200 canreduce ligament issues, like carpal tunnel. As shown in FIG. 15, thehandle 200 includes a proximal end 202, a distal end 204, which includesa portion 206 extending from the proximal to the distal end 202, 204. Aproximal portion 208 of the handle 200 is at an angle of betweenapproximately 5 to 75 degrees, and more preferably 15 to 45 degrees tothe distal portion 210. On an underside of the proximal portion 208 ofthe grip handle 200, the underside has a series of grooves or notches,which assists the user in gripping the handle 200. The handle 200 alsoincludes a trigger 214 for activating the motor and imparts a sinusoidalmotion to the movable inner tine section of the fork head 30. Inaddition, an optional trigger rest 212 can be include adjacent to thetrigger 214, which provides a place or portion for the user to rest histrigger finger when the motorized portion of the fork 10 is not in useror activated. In accordance with another exemplary embodiment, thetrigger 214 is an optional feature for non-motorized rakes and/or forks10.

FIG. 16 shows a bottom view of the grip or grip handle 200 of a motionassisted sifting fork as shown in FIG. 15. As shown in FIG. 16, on theunderside (or bottom) of the proximal portion 208 of the grip handle200, the underside has a series (or plurality) of grooves or notches,which assists the user in gripping the handle 200. As shown, the handle200 also includes a trigger 214 for activating the motor and imparts asinusoidal motion to the movable inner tine section of the fork head 30.In addition, an optional trigger rest 212 can be positioned adjacent tothe trigger 214, which provides a location for the user to rest histrigger finger when the motorized portion of the fork 10 is not in useror activated.

In accordance with an exemplary embodiment, the grip or grip handle 200houses the electronics and/or power source 72 for powering and/oroperating the motorized portion of the fork 10. For example, inaccordance with an exemplary embodiment, grip or grip handle houses arechargeable battery or cell, which can be recharged using an electricalsource of power (not shown). The proximal portion 202 of the handle 200can include an electrical connection for receiving the source ofelectrical power.

While the invention has been described in detail with reference to thepreferred embodiments thereof, it will be apparent to one skilled in theart that various changes and modifications can be made and equivalentsemployed, without departing from the present invention.

1. A rake comprising: a handle; and a rake head comprising: a framehaving a neck dimensioned to receive one end of the handle; a pluralityof tines, the plurality of tines comprising: a movable inner tinesection, the movable inner tine section having a first movable innertine section, a second movable inner tine section and at least one fixedinner tine between the first movable inner tine section and the secondinner tine section; and a fixed outer tine section on each side of theinner section; a support member extending across the plurality of tines,the support member comprising a plurality of supports positioned betweenthe tines; and a screening material, which separates a wanted materialfrom an unwanted material.
 2. The rake of claim 1, further comprising aplurality of hinges, the plurality of hinges connecting the first andsecond movable inner tine sections to the fixed outer tine sections andthe fixed inner tine section.
 3. The rake of claim 2, wherein the hingedivides the movable inner tine section into an upper tine segment and alower tine segment.
 4. The rake of claim 3, further comprising a slotbetween the frame and the first and second movable inner tine sections.5. The rake of claim 1, further comprising a leverage assembly, whereinthe leverage assembly imparts a sinusoidal motion to the movable innertine section.
 6. The rake of claim 5, wherein the leverage assemblyfurther includes a motor assembly.
 7. rake of claim 1, furthercomprising an internal power source contained within an upper end of thehandle.
 8. The rake of claim 6, further comprising a variable controlswitch, wherein the variable control switch varies the speed of themotor assembly that causes the plurality of tines to have a sinusoidalmotion.
 9. A rake comprising: a handle, the handle having a grip, whichincludes an upper portion and a lower portion, the upper portion and thelower portion being at an angle to one another; and a rake headcomprising: a frame having a neck dimensioned to receive one end of thehandle; and a plurality of tines; and a motor assembly, wherein themotor assembly imparts a sinusoidal motion to the plurality of tines.10. The rake of claim 9, wherein the plurality of tines furthercomprises a movable inner tine section, the movable inner tine sectionhaving a first movable inner tine section, a second movable inner tinesection and at least one fixed inner tine between the first movableinner tine section and the second inner tine section; and
 11. The rakeof claim 9, further comprising a support member extending across theplurality of tines, wherein the support member comprises a plurality ofsupports positioned between the tines to provide strength to the forkhead during use.
 12. The rake of claim 9, wherein the motor assemblyfurther comprises a variable control switch, wherein the variablecontrol switch comprises a variable speed function, wherein the variablespeed function varies the speed of the motor assembly that causes theplurality of tines to move in a sinusoidal motion.
 13. A rakecomprising: a handle, the handle having a grip, which includes an upperportion and a lower portion, the upper portion and the lower portionbeing at an angle to one another; and a rake head comprising: a framehaving a neck dimensioned to receive one end of the handle; a pluralityof tines, the plurality of tines comprising: a movable inner tinesection, the movable inner tine section having a first movable innertine section, a second movable inner tine section and at least one fixedinner tine between the first movable inner tine section and the secondinner tine section; and a fixed outer tine section on each side of theinner section; a pair of hinges positioned between the first and secondmovable inner tine sections and the outer tine sections; a pair ofhinges positioned between the first and second movable inner tinesections and the at least one fixed inner tine; a support memberextending across the plurality of tines, the support member comprising aplurality of supports positioned between the tines, wherein the outertine sections are attached to and extend from the frame, and the innertine section is not fixedly attached to the frame except by the hinge;and a screening material, which separates a wanted material from anunwanted material; a motor assembly; and a leverage assembly, whereinthe leverage assembly is attached to at least a portion of the movableinner tine section at one end and moveably attached to the handle at asecond, wherein the motor assembly imparts a sinusoidal motion to theplurality of tines via the leverage assembly.
 14. The rake of claim 13,further comprising a motion activation assembly attached to the motorassembly and a connecting rod.
 15. The rake of claim 14, wherein theconnecting rod is dimensioned to be moveably attached to the handle. 16.The rake of claim 13, further comprising a variable control switch,wherein the variable control switch comprises a variable speed function,which varies the speed of the motor assembly.